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首页> 外文期刊>Iranian polymer journal >Morphology and viscoelastic behavior of silicone rubber/EPDM/Cloisite 15A nanocomposites based on Maxwell model
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Morphology and viscoelastic behavior of silicone rubber/EPDM/Cloisite 15A nanocomposites based on Maxwell model

机译：基于Maxwell模型的硅橡胶/ EPDM / Cloisite 15A纳米复合材料的形貌和粘弹性行为

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摘要

Blends of silicone rubber (SR) and ethylene propylene diene monomer (EPDM) are immiscible due to different polarity and poor interfacial surface tension between their rubber chains. In this study, compatibilizing effect of a nanoclay addition in SR/EPDM blends was investigated. Viscoelasticity and morphology of nanocomposites based on SR and EPDM, containing 10, 20 and 30 wt% of EPDM and 3, 6 and 9 phr of nanoclay (Cloisite 15A), were studied. The curing behavior of the samples showed that the vulcanization rate and cross-link density of the blends increased with increases in SR content. Morphological study was conducted by XRD, SEM and EDX analyses and they indicated that the nanoparticles tended to disperse in the EPDM phase and consequently caused hardness and the elasticity of this phase in nanocomposites increased. Tensile properties of the samples showed a good fitting between that of experiments and the Maxwell model at initial time of testing (1.5 s) for all the blends. Sample parameters including modulus (E), viscosity (eta) and relaxation time (tau) calculated by the Maxwell model revealed that those samples with higher content of nanoparticles exhibit higher modulus and lower relaxation time. The good match in tensile properties based on Maxwell model and those of the experimental data was attributed to good dispersion of nanoclay in the blends.
机译：硅橡胶（SR）和乙丙二烯单体（EPDM）的共混物由于其极性不同和橡胶链之间的界面张力差而不能混溶。在这项研究中，研究了在SR / EPDM共混物中添加纳米粘土的增容作用。研究了基于SR和EPDM的纳米复合材料的粘弹性和形貌，该复合材料包含10、20和30 wt％的EPDM和3、6和9 phr的纳米粘土（Cloisite 15A）。样品的固化行为表明，共混物的硫化速率和交联密度随SR含量的增加而增加。通过XRD，SEM和EDX分析进行了形态学研究，结果表明纳米粒子倾向于分散在EPDM相中，从而导致纳米复合材料中该相的硬度和弹性增加。对于所有混合物，样品的拉伸性能在测试的初始时间（1.5 s）显示出与实验和Maxwell模型之间的良好拟合。通过麦克斯韦（Maxwell）模型计算的样品参数包括模量（E），粘度（η）和弛豫时间（tau）表明，那些纳米颗粒含量较高的样品表现出较高的模量和较低的弛豫时间。基于麦克斯韦模型和实验数据的拉伸性能的良好匹配归因于纳米粘土在共混物中的良好分散性。

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